4-46. Which of the following buoy characteristics  assists  the  mariner in  following  the  proper  course? 1.    Shape 2.    Light 3.    Color 4.    Each of the above IN ANSWERING QUESTIONS 4-47 THROUGH 4-50, SELECT FROM COLUMN B THE DESCRIPTION THAT MATCHES THE TYPE OF BUOY IN COLUMN A. RESPONSES ARE USED ONLY ONCE. A.  TYPE B.  DESCRIPTION 4-47.  Nun buoy 1. Cylindrical, often  large 4-48.  Can  buoy logs,  painted appropriate 4-49.  Spar  buoy colors 4-50.  Spherical  buoy 2. Barrel shaped, unlighted, painted  green or green and red  horizontal bands 3. Resembles a cone, painted  red  or red and green horizontal  bands 4. Round in shape, painted  with  red and  white vertical  stripes 4-51. What type of buoy produces a sound signal and shows a light? 1.    Whistle  buoy 2.    Combination buoy 3.    Lighted  buoy 4.    Gong  buoy 4-52. Buoys may be unreliable for which of  the  following  reasons? 1.    Passing  vessels  may  hit  them 2.    Lights on a lighted buoy may fail 3.    Sound  signals  may  not  function because  of  ice 4.    Each of the above IN ANSWERING QUESTIONS 4-53 AND 4-54, SELECT FROM COLUMN B THE BUOYAGE SYSTEM THAT MATCHES THE DEFINITION IN COLUMN A. NOT ALL RESPONSES ARE USED. 4-53 4-54 A.  DEFINITION Aids generally mark the geo- graphic  relation ship to north, south,  east,  and west Indicates  the port and star- board  sides  of a  navigational channel B. BUOYAGE SYSTEM 1.  Lateral 2.  Cardinal 3.  Safe  water 4-55. Of the following directions, which one  conforms  to  the  conventional direction  of  buoyage? 1.    North  along  the  Atlantic  coast 2.    South  along  the  Gulf  coast 3.   East  along  the  Pacific  coast 4.   West along the Gulf coast 4-56. Virtually all U.S. lateral marks are located in what is known as IALA region B and follow the traditional  "red  right  returning" rule. 4-57 4-58 4-59 1.    True 2.    False Buoys of the IALA buoyage system use which of the following buoy characteristics  to  convey  desired information  to  the  navigator? 1.    Shape 2.    Color 3.   Rhythm 4.    Each of the above Which of the following ports is included in the IALA system A? 1.    Guantanamo  Bay,  Cuba 2.    Halifax,  Nova  Scotia 3.    Buenos  Aires,  Argentina 4.    Naples,  Italy What should be the color of the first  buoy  to  starboard  when approaching  the  harbor  at Barcelona,  Spain? 1.    Green 2. Red 3.   Black 4.    Orange 22